Abstract: A rotary tool includes a tool body, a motor, a determining part, a monitoring part and a criterion changing part. The motor is housed in the tool body and configured to drive the tool accessory. The determining part is configured to determine whether or not excessive rotation of the tool body around the driving axis due to jamming of the tool accessory occurs, according to a specific determination criterion. The monitoring part is configured to monitor information relating to a use state of the rotary tool. The criterion changing part is configured to change the determination criterion according to the use state.

Abstract: A dust collector attachment for use with a drilling tool is configured to suck dust generated during the drilling operation. The dust collector attachment includes a suction nozzle and a detection part The suction nozzle has an insertion hole that is configured to allow a tool accessory removably held by the drilling tool to be inserted therethrough, and a suction port through which the dust is sucked. The detection part includes a sensor that is configured to detect metal within a detection range.

Abstract: An embedded-object scanner device includes a housing and a sensing device, which is housed in the housing and senses one or more embedded objects embedded in a target material when moved across the target material. One or more illumination devices is provided on the housing for illuminating at least a portion of the surface of the target material.

Abstract: An electric working machine in one aspect of the present disclosure includes an output shaft, a motor, a housing, an acceleration detector, a twisted motion detector, a reference level changer, and a motor controller. The acceleration detector detects an acceleration of the housing in a circumferential direction of the output shaft. The twisted motion detector detects a twisted motion of the housing based on a reference level and the acceleration detected. The reference level determines that the housing is twisted. The reference level changer changes the reference level based on a rotating motion of the output shaft.

Abstract: An embedded-object scanner device includes a sensing device housed in a housing and configured to sense one or more embedded objects embedded in a target material, and a display device provided on the housing. The display device is configured to collectively display multiple sets of display data generated in multiple sensing operations performed by the sensing device.

Abstract: A power tool having a rotary hammer mechanism has a first motor; a driving mechanism configured to operate by power of the first motor in an action mode selected from a plurality of action modes including a first mode of at least rotationally driving a tool accessory and a second mode of only linearly driving the accessory; a tool holder configured to be rotationally driven by torque transmitted from the first motor; a second motor; a clutch member configured to transmit torque to the holder in a transmitting position and to interrupt the transmission in an interrupting position; and a transmitting mechanism configured to convert rotation of the second motor into linear motion and transmit the linear motion to the clutch member. When the tool body excessively rotates around the driving axis, the second motor moves the clutch member from the transmitting position via transmitting mechanism to interrupt the transmission.

Abstract: A rotary tool includes a tool body, a motor, a determining part, a monitoring part and a criterion changing part. The motor is housed in the tool body and configured to drive the tool accessory. The determining part is configured to determine whether or not excessive rotation of the tool body around the driving axis due to jamming of the tool accessory occurs, according to a specific determination criterion. The monitoring part is configured to monitor information relating to a use state of the rotary tool. The criterion changing part is configured to change the determination criterion according to the use state.

Abstract: A drilling tool includes a tool body, a brushless motor, a first detector, a second detector and a control device. The brushless motor is housed in the tool body and configured to drive the tool accessory. The first detector is configured to detect first information corresponding to a load applied to the tool accessory. The second detector is configured to detect second information corresponding to a rotation state of the tool body around the driving axis. The control device is configured to control operation of the drilling tool. The control device is configured to set a conduction angle for the brushless motor based on the first information, and to determine, based on the first information and the second information, whether or not excessive rotation of the tool body due to jamming of the tool accessory occurs.

Abstract: An electric power tool is configured to rotate an attachment about a Z-axis. The electric power tool includes a three-axes acceleration sensor and an acceleration detection circuit. The acceleration detection circuit calculates an angular acceleration about the Z-axis based on an input signal from the three-axes acceleration sensor. The acceleration detection circuit calculates a change in an angular velocity based on integrating the angular acceleration for a most recent period. The acceleration detection circuit determines a Z-axis angular velocity about the Z-axis, without adding a previous change in the angular velocity from before the most recent period, as equal to the change in angular velocity. The acceleration detection circuit detects a twisted-motion of the electric power tool based on the Z-axis angular velocity.

Abstract: An electric working machine in one aspect of the present disclosure includes an output shaft, a motor, a housing, an acceleration detector, a twisted motion detector, a reference level changer, and a motor controller. The acceleration detector detects an acceleration of the housing in a circumferential direction of the output shaft. The twisted motion detector detects a twisted motion of the housing based on a reference level and the acceleration detected. The reference level determines that the housing is twisted. The reference level changer changes the reference level based on a rotating motion of the output shaft.

Abstract: An impact tool includes a tool-accessory holding part, a body and a first hammering member. The tool-accessory holding part has a through hole extending in a hammering-axis direction and is configured to hold the tool accessory inserted into the through hole to be movable in the hammering-axis direction. The body is connected to the tool-accessory holding part in the hammering-axis direction and has an internal space communicating with the through hole. The first hammering member is linearly movable in the hammering-axis direction and configured to drive the tool accessory in the hammering-axis direction by colliding with the tool accessory. The tool-accessory holding part and the body are connected in the hammering-axis direction via a first elastic element to be movable relative to each other. A second elastic element is interposed between the first hammering member and the body in a radial direction with respect to the hammering axis.

Abstract: An embedded-object scanner device includes a sensing device housed in a housing and configured to sense one or more embedded objects embedded in a target material, and a display device provided on the housing. The display device is configured to collectively display multiple sets of display data generated in multiple sensing operations performed by the sensing device.

Abstract: A power tool (1) includes an electric motor (2) as a drive source and a start switch (20; 61) that starts the electric motor (2) and is lockable in an ON position in a lock-ON state. An electromagnetic actuator (30; 40; 50; 60) pushes out or pulls in an actuation pin (30a; 40a; 50a; 60a) with respect to a body of the electromagnetic actuator (30; 40; 50; 60) in response to cutting off of a supply of electrical current to the power tool (1). The pushed-out or pulled-in actuation pin, directly or indirectly, disengages the start switch (20; 61) from the lock-ON state and/or prevents the start switch (20; 61) from being shifted into the lock-ON state.

Abstract: An impact tool includes a tool-accessory holding part, a body and a first hammering member. The tool-accessory holding part has a through hole extending in a hammering-axis direction and is configured to hold the tool accessory inserted into the through hole to be movable in the hammering-axis direction. The body is connected to the tool-accessory holding part in the hammering-axis direction and has an internal space communicating with the through hole. The first hammering member is linearly movable in the hammering-axis direction and configured to drive the tool accessory in the hammering-axis direction by colliding with the tool accessory. The tool-accessory holding part and the body are connected in the hammering-axis direction via a first elastic element to be movable relative to each other. A second elastic element is interposed between the first hammering member and the body in a radial direction with respect to the hammering axis.

Abstract: An electric power tool includes a housing, a motor, an output shaft, an acceleration sensor, and a twisted-motion detector. The housing is configured to house the motor and the output shaft. The acceleration sensor is configured to detect acceleration of the housing. The twisted-motion detector is configured to repeatedly obtain acceleration of the housing in the circumferential direction of the output shaft, to calculate a speed by integrating, of the obtained accelerations, accelerations obtained in a certain period, and to detect twisting of the housing from the speed.

Abstract: An electric power tool in one aspect of the present disclosure includes a housing; a motor; an output shaft; a rotation transmission; a motor controller; and a twisted-motion detector. The twisted-motion detector is disposed in the housing independently from the motor controller. The twisted-motion detector detects a twisted-motion of the housing in the circumferential direction of the output shaft and outputs a result of the detection to the motor controller.

Abstract: A power tool (1) includes an electric motor (2) as a drive source and a start switch (20; 61) that starts the electric motor (2) and is lockable in an ON position in a lock-ON state. An electromagnetic actuator (30; 40; 50; 60) pushes out or pulls in an actuation pin (30a; 40a; 50a; 60a) with respect to a body of the electromagnetic actuator (30; 40; 50; 60) in response to cutting off of a supply of electrical current to the power tool (1). The pushed-out or pulled-in actuation pin, directly or indirectly, disengages the start switch (20; 61) from the lock-ON state and/or prevents the start switch (20; 61) from being shifted into the lock-ON state.

Abstract: It is an object of the invention to provide a further rational technique in the arrangement structure of members of a power tool which is configured to be capable of detecting behavior during operation. A representative power tool has a body 101 that has a driving mechanism housing region 101a for housing a driving mechanism 120 and a controller housing region 101b for housing a controller 140, a first sensor 171 for detecting behavior of the body 101 and a second sensor 172 for detecting behavior of the body 101. The first sensor 171 and the second sensor 172 are arranged in the driving mechanism housing region 101a and the controller housing region 101b, respectively.

Abstract: A grinder as a power tool has a torque limiter. The torque limiter includes a second bevel gear; a spindle; a flange to which the rotation of the second bevel gear is transmitted, and a plurality of balls which are disposed between the second bevel gear and the flange. The ball is positioned at a first region and the second bevel gear, the ball and the flange rotate integrally thereby the rotation is transmitted to the flange. In a state that a torque exerted on the spindle exceeding the predetermined threshold, a relative rotation between the second bevel gear and the flange is occurred and the ball moves from the first region to the second region while rolling by means of the relative rotation. Therefore, the transmission of the rotation from the second bevel gear to the flange is regulated, and the torque exerted on the spindle is regulated.